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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cf40cb458c9821d105e57646f3f1d99cd2010f8e96cef0c6c27d0e9b9bddf0' 
  AND token = '2zVC5feTBWi9+AOUgihlf6ZDRxp5bjKP6SuHq/k/0jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}